diff options
Diffstat (limited to 'source4/heimdal/lib/hx509/cert.c')
| -rw-r--r-- | source4/heimdal/lib/hx509/cert.c | 2214 |
1 files changed, 2214 insertions, 0 deletions
diff --git a/source4/heimdal/lib/hx509/cert.c b/source4/heimdal/lib/hx509/cert.c new file mode 100644 index 00000000000..f84c61a7982 --- /dev/null +++ b/source4/heimdal/lib/hx509/cert.c @@ -0,0 +1,2214 @@ +/* + * Copyright (c) 2004 - 2007 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "hx_locl.h" +RCSID("$Id: cert.c,v 1.82 2007/01/09 10:52:03 lha Exp $"); +#include "crypto-headers.h" + +struct hx509_verify_ctx_data { + hx509_certs trust_anchors; + int flags; +#define HX509_VERIFY_CTX_F_TIME_SET 1 +#define HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE 2 +#define HX509_VERIFY_CTX_F_REQUIRE_RFC3280 4 +#define HX509_VERIFY_CTX_F_CHECK_TRUST_ANCHORS 8 + time_t time_now; + unsigned int max_depth; +#define HX509_VERIFY_MAX_DEPTH 30 + hx509_revoke_ctx revoke_ctx; +}; + +#define REQUIRE_RFC3280(ctx) ((ctx)->flags & HX509_VERIFY_CTX_F_REQUIRE_RFC3280) +#define CHECK_TA(ctx) ((ctx)->flags & HX509_VERIFY_CTX_F_CHECK_TRUST_ANCHORS) + +struct _hx509_cert_attrs { + size_t len; + hx509_cert_attribute *val; +}; + +struct hx509_cert_data { + unsigned int ref; + char *friendlyname; + Certificate *data; + hx509_private_key private_key; + struct _hx509_cert_attrs attrs; + hx509_name basename; + _hx509_cert_release_func release; + void *ctx; +}; + +typedef struct hx509_name_constraints { + NameConstraints *val; + size_t len; +} hx509_name_constraints; + +#define GeneralSubtrees_SET(g,var) \ + (g)->len = (var)->len, (g)->val = (var)->val; + +/* + * + */ + +void +_hx509_abort(const char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + vprintf(fmt, ap); + va_end(ap); + printf("\n"); + fflush(stdout); + abort(); +} + +/* + * + */ + +int +hx509_context_init(hx509_context *context) +{ + *context = calloc(1, sizeof(**context)); + if (*context == NULL) + return ENOMEM; + + _hx509_ks_mem_register(*context); + _hx509_ks_file_register(*context); + _hx509_ks_pkcs12_register(*context); + _hx509_ks_pkcs11_register(*context); + _hx509_ks_dir_register(*context); + + ENGINE_add_conf_module(); + OpenSSL_add_all_algorithms(); + + (*context)->ocsp_time_diff = HX509_DEFAULT_OCSP_TIME_DIFF; + + initialize_hx_error_table_r(&(*context)->et_list); + initialize_asn1_error_table_r(&(*context)->et_list); + + return 0; +} + +void +hx509_context_set_missing_revoke(hx509_context context, int flag) +{ + if (flag) + context->flags |= HX509_CTX_VERIFY_MISSING_OK; + else + context->flags &= ~HX509_CTX_VERIFY_MISSING_OK; +} + +void +hx509_context_free(hx509_context *context) +{ + hx509_clear_error_string(*context); + if ((*context)->ks_ops) { + free((*context)->ks_ops); + (*context)->ks_ops = NULL; + } + (*context)->ks_num_ops = 0; + free_error_table ((*context)->et_list); + free(*context); + *context = NULL; +} + + +/* + * + */ + +Certificate * +_hx509_get_cert(hx509_cert cert) +{ + return cert->data; +} + +/* + * + */ + +#if 0 +void +_hx509_print_cert_subject(hx509_cert cert) +{ + char *subject_name; + hx509_name name; + int ret; + + ret = hx509_cert_get_subject(cert, &name); + if (ret) + abort(); + + ret = hx509_name_to_string(name, &subject_name); + hx509_name_free(&name); + if (ret) + abort(); + + printf("name: %s\n", subject_name); + + free(subject_name); +} +#endif + +/* + * + */ + +int +_hx509_cert_get_version(const Certificate *t) +{ + return t->tbsCertificate.version ? *t->tbsCertificate.version + 1 : 1; +} + +int +hx509_cert_init(hx509_context context, const Certificate *c, hx509_cert *cert) +{ + int ret; + + *cert = malloc(sizeof(**cert)); + if (*cert == NULL) + return ENOMEM; + (*cert)->ref = 1; + (*cert)->friendlyname = NULL; + (*cert)->attrs.len = 0; + (*cert)->attrs.val = NULL; + (*cert)->private_key = NULL; + (*cert)->basename = NULL; + (*cert)->release = NULL; + (*cert)->ctx = NULL; + + (*cert)->data = calloc(1, sizeof(*(*cert)->data)); + if ((*cert)->data == NULL) { + free(*cert); + return ENOMEM; + } + ret = copy_Certificate(c, (*cert)->data); + if (ret) { + free((*cert)->data); + free(*cert); + } + return ret; +} + +void +_hx509_cert_set_release(hx509_cert cert, + _hx509_cert_release_func release, + void *ctx) +{ + cert->release = release; + cert->ctx = ctx; +} + + +/* Doesn't make a copy of `private_key'. */ + +int +_hx509_cert_assign_key(hx509_cert cert, hx509_private_key private_key) +{ + if (cert->private_key) + _hx509_private_key_free(&cert->private_key); + cert->private_key = _hx509_private_key_ref(private_key); + return 0; +} + +void +hx509_cert_free(hx509_cert cert) +{ + int i; + + if (cert == NULL) + return; + + if (cert->ref <= 0) + _hx509_abort("refcount <= 0"); + if (--cert->ref > 0) + return; + + if (cert->release) + (cert->release)(cert, cert->ctx); + + if (cert->private_key) + _hx509_private_key_free(&cert->private_key); + + free_Certificate(cert->data); + free(cert->data); + + for (i = 0; i < cert->attrs.len; i++) { + der_free_octet_string(&cert->attrs.val[i]->data); + der_free_oid(&cert->attrs.val[i]->oid); + free(cert->attrs.val[i]); + } + free(cert->attrs.val); + free(cert->friendlyname); + if (cert->basename) + hx509_name_free(&cert->basename); + memset(cert, 0, sizeof(cert)); + free(cert); +} + +hx509_cert +hx509_cert_ref(hx509_cert cert) +{ + if (cert->ref <= 0) + _hx509_abort("refcount <= 0"); + cert->ref++; + if (cert->ref == 0) + _hx509_abort("refcount == 0"); + return cert; +} + +int +hx509_verify_init_ctx(hx509_context context, hx509_verify_ctx *ctx) +{ + hx509_verify_ctx c; + + c = calloc(1, sizeof(*c)); + if (c == NULL) + return ENOMEM; + + c->max_depth = HX509_VERIFY_MAX_DEPTH; + + *ctx = c; + + return 0; +} + +void +hx509_verify_destroy_ctx(hx509_verify_ctx ctx) +{ + if (ctx) + memset(ctx, 0, sizeof(*ctx)); + free(ctx); +} + +void +hx509_verify_attach_anchors(hx509_verify_ctx ctx, hx509_certs set) +{ + ctx->trust_anchors = set; +} + +void +hx509_verify_attach_revoke(hx509_verify_ctx ctx, hx509_revoke_ctx revoke_ctx) +{ + ctx->revoke_ctx = revoke_ctx; +} + +void +hx509_verify_set_time(hx509_verify_ctx ctx, time_t t) +{ + ctx->flags |= HX509_VERIFY_CTX_F_TIME_SET; + ctx->time_now = t; +} + +void +hx509_verify_set_proxy_certificate(hx509_verify_ctx ctx, int boolean) +{ + if (boolean) + ctx->flags |= HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE; + else + ctx->flags &= ~HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE; +} + +void +hx509_verify_set_strict_rfc3280_verification(hx509_verify_ctx ctx, int boolean) +{ + if (boolean) + ctx->flags |= HX509_VERIFY_CTX_F_REQUIRE_RFC3280; + else + ctx->flags &= ~HX509_VERIFY_CTX_F_REQUIRE_RFC3280; +} + +static const Extension * +find_extension(const Certificate *cert, const heim_oid *oid, int *idx) +{ + const TBSCertificate *c = &cert->tbsCertificate; + + if (c->version == NULL || *c->version < 2 || c->extensions == NULL) + return NULL; + + for (;*idx < c->extensions->len; (*idx)++) { + if (der_heim_oid_cmp(&c->extensions->val[*idx].extnID, oid) == 0) + return &c->extensions->val[(*idx)++]; + } + return NULL; +} + +static int +find_extension_auth_key_id(const Certificate *subject, + AuthorityKeyIdentifier *ai) +{ + const Extension *e; + size_t size; + int i = 0; + + memset(ai, 0, sizeof(*ai)); + + e = find_extension(subject, oid_id_x509_ce_authorityKeyIdentifier(), &i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_AuthorityKeyIdentifier(e->extnValue.data, + e->extnValue.length, + ai, &size); +} + +int +_hx509_find_extension_subject_key_id(const Certificate *issuer, + SubjectKeyIdentifier *si) +{ + const Extension *e; + size_t size; + int i = 0; + + memset(si, 0, sizeof(*si)); + + e = find_extension(issuer, oid_id_x509_ce_subjectKeyIdentifier(), &i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_SubjectKeyIdentifier(e->extnValue.data, + e->extnValue.length, + si, &size); +} + +static int +find_extension_name_constraints(const Certificate *subject, + NameConstraints *nc) +{ + const Extension *e; + size_t size; + int i = 0; + + memset(nc, 0, sizeof(*nc)); + + e = find_extension(subject, oid_id_x509_ce_nameConstraints(), &i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_NameConstraints(e->extnValue.data, + e->extnValue.length, + nc, &size); +} + +static int +find_extension_subject_alt_name(const Certificate *cert, int *i, + GeneralNames *sa) +{ + const Extension *e; + size_t size; + + memset(sa, 0, sizeof(*sa)); + + e = find_extension(cert, oid_id_x509_ce_subjectAltName(), i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_GeneralNames(e->extnValue.data, + e->extnValue.length, + sa, &size); +} + +static int +find_extension_eku(const Certificate *cert, ExtKeyUsage *eku) +{ + const Extension *e; + size_t size; + int i = 0; + + memset(eku, 0, sizeof(*eku)); + + e = find_extension(cert, oid_id_x509_ce_extKeyUsage(), &i); + if (e == NULL) + return HX509_EXTENSION_NOT_FOUND; + + return decode_ExtKeyUsage(e->extnValue.data, + e->extnValue.length, + eku, &size); +} + +static int +add_to_list(hx509_octet_string_list *list, const heim_octet_string *entry) +{ + void *p; + int ret; + + p = realloc(list->val, (list->len + 1) * sizeof(list->val[0])); + if (p == NULL) + return ENOMEM; + list->val = p; + ret = der_copy_octet_string(entry, &list->val[list->len]); + if (ret) + return ret; + list->len++; + return 0; +} + +void +hx509_free_octet_string_list(hx509_octet_string_list *list) +{ + int i; + for (i = 0; i < list->len; i++) + der_free_octet_string(&list->val[i]); + free(list->val); + list->val = NULL; + list->len = 0; +} + +int +hx509_cert_find_subjectAltName_otherName(hx509_cert cert, + const heim_oid *oid, + hx509_octet_string_list *list) +{ + GeneralNames sa; + int ret, i, j; + + list->val = NULL; + list->len = 0; + + i = 0; + while (1) { + ret = find_extension_subject_alt_name(_hx509_get_cert(cert), &i, &sa); + i++; + if (ret == HX509_EXTENSION_NOT_FOUND) { + ret = 0; + break; + } else if (ret != 0) + break; + + + for (j = 0; j < sa.len; j++) { + if (sa.val[j].element == choice_GeneralName_otherName && + der_heim_oid_cmp(&sa.val[j].u.otherName.type_id, oid) == 0) + { + ret = add_to_list(list, &sa.val[j].u.otherName.value); + if (ret) { + free_GeneralNames(&sa); + return ret; + } + } + } + free_GeneralNames(&sa); + } + return ret; +} + + +static int +check_key_usage(hx509_context context, const Certificate *cert, + unsigned flags, int req_present) +{ + const Extension *e; + KeyUsage ku; + size_t size; + int ret, i = 0; + unsigned ku_flags; + + if (_hx509_cert_get_version(cert) < 3) + return 0; + + e = find_extension(cert, oid_id_x509_ce_keyUsage(), &i); + if (e == NULL) { + if (req_present) { + hx509_set_error_string(context, 0, HX509_KU_CERT_MISSING, + "Required extension key " + "usage missing from certifiate"); + return HX509_KU_CERT_MISSING; + } + return 0; + } + + ret = decode_KeyUsage(e->extnValue.data, e->extnValue.length, &ku, &size); + if (ret) + return ret; + ku_flags = KeyUsage2int(ku); + if ((ku_flags & flags) != flags) { + unsigned missing = (~ku_flags) & flags; + char buf[256], *name; + + unparse_flags(missing, asn1_KeyUsage_units(), buf, sizeof(buf)); + _hx509_unparse_Name(&cert->tbsCertificate.subject, &name); + hx509_set_error_string(context, 0, HX509_KU_CERT_MISSING, + "Key usage %s required but missing " + "from certifiate %s", buf, name); + free(name); + return HX509_KU_CERT_MISSING; + } + return 0; +} + +int +_hx509_check_key_usage(hx509_context context, hx509_cert cert, + unsigned flags, int req_present) +{ + return check_key_usage(context, _hx509_get_cert(cert), flags, req_present); +} + +enum certtype { PROXY_CERT, EE_CERT, CA_CERT }; + +static int +check_basic_constraints(hx509_context context, const Certificate *cert, + enum certtype type, int depth) +{ + BasicConstraints bc; + const Extension *e; + size_t size; + int ret, i = 0; + + if (_hx509_cert_get_version(cert) < 3) + return 0; + + e = find_extension(cert, oid_id_x509_ce_basicConstraints(), &i); + if (e == NULL) { + switch(type) { + case PROXY_CERT: + case EE_CERT: + return 0; + case CA_CERT: { + char *name; + ret = _hx509_unparse_Name(&cert->tbsCertificate.subject, &name); + assert(ret == 0); + hx509_set_error_string(context, 0, HX509_EXTENSION_NOT_FOUND, + "basicConstraints missing from " + "CA certifiacte %s", name); + free(name); + return HX509_EXTENSION_NOT_FOUND; + } + } + } + + ret = decode_BasicConstraints(e->extnValue.data, + e->extnValue.length, &bc, + &size); + if (ret) + return ret; + switch(type) { + case PROXY_CERT: + if (bc.cA != NULL && *bc.cA) + ret = HX509_PARENT_IS_CA; + break; + case EE_CERT: + ret = 0; + break; + case CA_CERT: + if (bc.cA == NULL || !*bc.cA) + ret = HX509_PARENT_NOT_CA; + else if (bc.pathLenConstraint) + if (depth - 1 > *bc.pathLenConstraint) + ret = HX509_CA_PATH_TOO_DEEP; + break; + } + free_BasicConstraints(&bc); + return ret; +} + +int +_hx509_cert_is_parent_cmp(const Certificate *subject, + const Certificate *issuer, + int allow_self_signed) +{ + int diff; + AuthorityKeyIdentifier ai; + SubjectKeyIdentifier si; + int ret_ai, ret_si; + + diff = _hx509_name_cmp(&issuer->tbsCertificate.subject, + &subject->tbsCertificate.issuer); + if (diff) + return diff; + + memset(&ai, 0, sizeof(ai)); + memset(&si, 0, sizeof(si)); + + /* + * Try to find AuthorityKeyIdentifier, if its not present in the + * subject certificate nor the parent. + */ + + ret_ai = find_extension_auth_key_id(subject, &ai); + if (ret_ai && ret_ai != HX509_EXTENSION_NOT_FOUND) + return 1; + ret_si = _hx509_find_extension_subject_key_id(issuer, &si); + if (ret_si && ret_si != HX509_EXTENSION_NOT_FOUND) + return -1; + + if (ret_si && ret_ai) + goto out; + if (ret_ai) + goto out; + if (ret_si) { + if (allow_self_signed) { + diff = 0; + goto out; + } else if (ai.keyIdentifier) { + diff = -1; + goto out; + } + } + + if (ai.keyIdentifier == NULL) { + Name name; + + if (ai.authorityCertIssuer == NULL) + return -1; + if (ai.authorityCertSerialNumber == NULL) + return -1; + + diff = der_heim_integer_cmp(ai.authorityCertSerialNumber, + &issuer->tbsCertificate.serialNumber); + if (diff) + return diff; + if (ai.authorityCertIssuer->len != 1) + return -1; + if (ai.authorityCertIssuer->val[0].element != choice_GeneralName_directoryName) + return -1; + + name.element = + ai.authorityCertIssuer->val[0].u.directoryName.element; + name.u.rdnSequence = + ai.authorityCertIssuer->val[0].u.directoryName.u.rdnSequence; + + diff = _hx509_name_cmp(&issuer->tbsCertificate.subject, + &name); + if (diff) + return diff; + diff = 0; + } else + diff = der_heim_octet_string_cmp(ai.keyIdentifier, &si); + if (diff) + goto out; + + out: + free_AuthorityKeyIdentifier(&ai); + free_SubjectKeyIdentifier(&si); + return diff; +} + +static int +certificate_is_anchor(hx509_context context, + hx509_certs trust_anchors, + const hx509_cert cert) +{ + hx509_query q; + hx509_cert c; + int ret; + + if (trust_anchors == NULL) + return 0; + + _hx509_query_clear(&q); + + q.match = HX509_QUERY_MATCH_CERTIFICATE; + q.certificate = _hx509_get_cert(cert); + + ret = hx509_certs_find(context, trust_anchors, &q, &c); + if (ret == 0) + hx509_cert_free(c); + return ret == 0; +} + +static int +certificate_is_self_signed(const Certificate *cert) +{ + return _hx509_cert_is_parent_cmp(cert, cert, 1) == 0; +} + +/* + * The subjectName is "null" when its empty set of relative DBs. + */ + +static int +subject_null_p(const Certificate *c) +{ + return c->tbsCertificate.subject.u.rdnSequence.len == 0; +} + + +static int +find_parent(hx509_context context, + time_t time_now, + hx509_certs trust_anchors, + hx509_path *path, + hx509_certs pool, + hx509_cert current, + hx509_cert *parent) +{ + AuthorityKeyIdentifier ai; + hx509_query q; + int ret; + + *parent = NULL; + memset(&ai, 0, sizeof(ai)); + + _hx509_query_clear(&q); + + if (!subject_null_p(current->data)) { + q.match |= HX509_QUERY_FIND_ISSUER_CERT; + q.subject = _hx509_get_cert(current); + } else { + ret = find_extension_auth_key_id(current->data, &ai); + if (ret) { + hx509_set_error_string(context, 0, HX509_CERTIFICATE_MALFORMED, + "Subjectless certificate missing AuthKeyID"); + return HX509_CERTIFICATE_MALFORMED; + } + + if (ai.keyIdentifier == NULL) { + free_AuthorityKeyIdentifier(&ai); + hx509_set_error_string(context, 0, HX509_CERTIFICATE_MALFORMED, + "Subjectless certificate missing keyIdentifier " + "inside AuthKeyID"); + return HX509_CERTIFICATE_MALFORMED; + } + + q.subject_id = ai.keyIdentifier; + q.match = HX509_QUERY_MATCH_SUBJECT_KEY_ID; + } + + q.path = path; + q.match |= HX509_QUERY_NO_MATCH_PATH; + + if (pool) { + q.timenow = time_now; + q.match |= HX509_QUERY_MATCH_TIME; + + ret = hx509_certs_find(context, pool, &q, parent); + if (ret == 0) { + free_AuthorityKeyIdentifier(&ai); + return 0; + } + q.match &= ~HX509_QUERY_MATCH_TIME; + } + + if (trust_anchors) { + ret = hx509_certs_find(context, trust_anchors, &q, parent); + if (ret == 0) { + free_AuthorityKeyIdentifier(&ai); + return ret; + } + } + free_AuthorityKeyIdentifier(&ai); + + { + hx509_name name; + char *str; + + ret = hx509_cert_get_subject(current, &name); + if (ret) { + hx509_clear_error_string(context); + return HX509_ISSUER_NOT_FOUND; + } + ret = hx509_name_to_string(name, &str); + hx509_name_free(&name); + if (ret) { + hx509_clear_error_string(context); + return HX509_ISSUER_NOT_FOUND; + } + + hx509_set_error_string(context, 0, HX509_ISSUER_NOT_FOUND, + "Failed to find issuer for " + "certificate with subject: %s", str); + free(str); + } + return HX509_ISSUER_NOT_FOUND; +} + +/* + * + */ + +static int +is_proxy_cert(hx509_context context, const Certificate *cert, ProxyCertInfo *rinfo) +{ + ProxyCertInfo info; + const Extension *e; + size_t size; + int ret, i = 0; + + if (rinfo) + memset(rinfo, 0, sizeof(*rinfo)); + + e = find_extension(cert, oid_id_pe_proxyCertInfo(), &i); + if (e == NULL) { + hx509_clear_error_string(context); + return HX509_EXTENSION_NOT_FOUND; + } + + ret = decode_ProxyCertInfo(e->extnValue.data, + e->extnValue.length, + &info, + &size); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + if (size != e->extnValue.length) { + free_ProxyCertInfo(&info); + hx509_clear_error_string(context); + return HX509_EXTRA_DATA_AFTER_STRUCTURE; + } + if (rinfo) + *rinfo = info; + + return 0; +} + +/* + * Path operations are like MEMORY based keyset, but with exposed + * internal so we can do easy searches. + */ + +int +_hx509_path_append(hx509_context context, hx509_path *path, hx509_cert cert) +{ + hx509_cert *val; + val = realloc(path->val, (path->len + 1) * sizeof(path->val[0])); + if (val == NULL) { + hx509_set_error_string(context, 0, ENOMEM, "out of memory"); + return ENOMEM; + } + + path->val = val; + path->val[path->len] = hx509_cert_ref(cert); + path->len++; + + return 0; +} + +void +_hx509_path_free(hx509_path *path) +{ + unsigned i; + + for (i = 0; i < path->len; i++) + hx509_cert_free(path->val[i]); + free(path->val); + path->val = NULL; + path->len = 0; +} + +/* + * Find path by looking up issuer for the top certificate and continue + * until an anchor certificate is found or max limit is found. A + * certificate never included twice in the path. + * + * If the trust anchors are not given, calculate optimistic path, just + * follow the chain upward until we no longer find a parent or we hit + * the max path limit. In this case, a failure will always be returned + * depending on what error condition is hit first. + * + * The path includes a path from the top certificate to the anchor + * certificate. + * + * The caller needs to free `path´ both on successful built path and + * failure. + */ + +int +_hx509_calculate_path(hx509_context context, + int flags, + time_t time_now, + hx509_certs anchors, + unsigned int max_depth, + hx509_cert cert, + hx509_certs pool, + hx509_path *path) +{ + hx509_cert parent, current; + int ret; + + if (max_depth == 0) + max_depth = HX509_VERIFY_MAX_DEPTH; + + ret = _hx509_path_append(context, path, cert); + if (ret) + return ret; + + current = hx509_cert_ref(cert); + + while (!certificate_is_anchor(context, anchors, current)) { + + ret = find_parent(context, time_now, anchors, path, + pool, current, &parent); + hx509_cert_free(current); + if (ret) + return ret; + + ret = _hx509_path_append(context, path, parent); + if (ret) + return ret; + current = parent; + + if (path->len > max_depth) { + hx509_set_error_string(context, 0, HX509_PATH_TOO_LONG, + "Path too long while bulding certificate chain"); + return HX509_PATH_TOO_LONG; + } + } + + if ((flags & HX509_CALCULATE_PATH_NO_ANCHOR) && + path->len > 0 && + certificate_is_anchor(context, anchors, path->val[path->len - 1])) + { + hx509_cert_free(path->val[path->len - 1]); + path->len--; + } + + hx509_cert_free(current); + return 0; +} + +static int +AlgorithmIdentifier_cmp(const AlgorithmIdentifier *p, + const AlgorithmIdentifier *q) +{ + int diff; + diff = der_heim_oid_cmp(&p->algorithm, &q->algorithm); + if (diff) + return diff; + if (p->parameters) { + if (q->parameters) + return heim_any_cmp(p->parameters, + q->parameters); + else + return 1; + } else { + if (q->parameters) + return -1; + else + return 0; + } +} + +int +_hx509_Certificate_cmp(const Certificate *p, const Certificate *q) +{ + int diff; + diff = der_heim_bit_string_cmp(&p->signatureValue, &q->signatureValue); + if (diff) + return diff; + diff = AlgorithmIdentifier_cmp(&p->signatureAlgorithm, + &q->signatureAlgorithm); + if (diff) + return diff; + diff = der_heim_octet_string_cmp(&p->tbsCertificate._save, + &q->tbsCertificate._save); + return diff; +} + +int +hx509_cert_cmp(hx509_cert p, hx509_cert q) +{ + return _hx509_Certificate_cmp(p->data, q->data); +} + +int +hx509_cert_get_issuer(hx509_cert p, hx509_name *name) +{ + return _hx509_name_from_Name(&p->data->tbsCertificate.issuer, name); +} + +int +hx509_cert_get_subject(hx509_cert p, hx509_name *name) +{ + return _hx509_name_from_Name(&p->data->tbsCertificate.subject, name); +} + +int +hx509_cert_get_base_subject(hx509_context context, hx509_cert c, + hx509_name *name) +{ + if (c->basename) + return hx509_name_copy(context, c->basename, name); + if (is_proxy_cert(context, c->data, NULL) == 0) { + int ret = HX509_PROXY_CERTIFICATE_NOT_CANONICALIZED; + hx509_set_error_string(context, 0, ret, + "Proxy certificate have not been " + "canonicalize yet, no base name"); + return ret; + } + return _hx509_name_from_Name(&c->data->tbsCertificate.subject, name); +} + +int +hx509_cert_get_serialnumber(hx509_cert p, heim_integer *i) +{ + return der_copy_heim_integer(&p->data->tbsCertificate.serialNumber, i); +} + +hx509_private_key +_hx509_cert_private_key(hx509_cert p) +{ + return p->private_key; +} + +int +_hx509_cert_private_key_exportable(hx509_cert p) +{ + if (p->private_key == NULL) + return 0; + return _hx509_private_key_exportable(p->private_key); +} + +int +_hx509_cert_private_decrypt(hx509_context context, + const heim_octet_string *ciphertext, + const heim_oid *encryption_oid, + hx509_cert p, + heim_octet_string *cleartext) +{ + cleartext->data = NULL; + cleartext->length = 0; + + if (p->private_key == NULL) { + hx509_set_error_string(context, 0, HX509_PRIVATE_KEY_MISSING, + "Private key missing"); + return HX509_PRIVATE_KEY_MISSING; + } + + return _hx509_private_key_private_decrypt(context, + ciphertext, + encryption_oid, + p->private_key, + cleartext); +} + +int +_hx509_cert_public_encrypt(hx509_context context, + const heim_octet_string *cleartext, + const hx509_cert p, + heim_oid *encryption_oid, + heim_octet_string *ciphertext) +{ + return _hx509_public_encrypt(context, + cleartext, p->data, + encryption_oid, ciphertext); +} + +/* + * + */ + +time_t +_hx509_Time2time_t(const Time *t) +{ + switch(t->element) { + case choice_Time_utcTime: + return t->u.utcTime; + case choice_Time_generalTime: + return t->u.generalTime; + } + return 0; +} + +/* + * + */ + +static int +init_name_constraints(hx509_name_constraints *nc) +{ + memset(nc, 0, sizeof(*nc)); + return 0; +} + +static int +add_name_constraints(hx509_context context, const Certificate *c, int not_ca, + hx509_name_constraints *nc) +{ + NameConstraints tnc; + int ret; + + ret = find_extension_name_constraints(c, &tnc); + if (ret == HX509_EXTENSION_NOT_FOUND) + return 0; + else if (ret) { + hx509_set_error_string(context, 0, ret, "Failed getting NameConstraints"); + return ret; + } else if (not_ca) { + ret = HX509_VERIFY_CONSTRAINTS; + hx509_set_error_string(context, 0, ret, "Not a CA and " + "have NameConstraints"); + } else { + NameConstraints *val; + val = realloc(nc->val, sizeof(nc->val[0]) * (nc->len + 1)); + if (val == NULL) { + hx509_clear_error_string(context); + ret = ENOMEM; + goto out; + } + nc->val = val; + ret = copy_NameConstraints(&tnc, &nc->val[nc->len]); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + nc->len += 1; + } +out: + free_NameConstraints(&tnc); + return ret; +} + +static int +match_RDN(const RelativeDistinguishedName *c, + const RelativeDistinguishedName *n) +{ + int i; + + if (c->len != n->len) + return HX509_NAME_CONSTRAINT_ERROR; + + for (i = 0; i < n->len; i++) { + if (der_heim_oid_cmp(&c->val[i].type, &n->val[i].type) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + if (_hx509_name_ds_cmp(&c->val[i].value, &n->val[i].value) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + } + return 0; +} + +static int +match_X501Name(const Name *c, const Name *n) +{ + int i, ret; + + if (c->element != choice_Name_rdnSequence + || n->element != choice_Name_rdnSequence) + return 0; + if (c->u.rdnSequence.len > n->u.rdnSequence.len) + return HX509_NAME_CONSTRAINT_ERROR; + for (i = 0; i < c->u.rdnSequence.len; i++) { + ret = match_RDN(&c->u.rdnSequence.val[i], &n->u.rdnSequence.val[i]); + if (ret) + return ret; + } + return 0; +} + + +static int +match_general_name(const GeneralName *c, const GeneralName *n, int *match) +{ + /* + * Name constraints only apply to the same name type, see RFC3280, + * 4.2.1.11. + */ + assert(c->element == n->element); + + switch(c->element) { + case choice_GeneralName_otherName: + if (der_heim_oid_cmp(&c->u.otherName.type_id, + &n->u.otherName.type_id) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + if (heim_any_cmp(&c->u.otherName.value, + &n->u.otherName.value) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + *match = 1; + return 0; + case choice_GeneralName_rfc822Name: { + const char *s; + size_t len1, len2; + s = strchr(c->u.rfc822Name, '@'); + if (s) { + if (strcasecmp(c->u.rfc822Name, n->u.rfc822Name) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + } else { + s = strchr(n->u.rfc822Name, '@'); + if (s == NULL) + return HX509_NAME_CONSTRAINT_ERROR; + len1 = strlen(c->u.rfc822Name); + len2 = strlen(s + 1); + if (len1 > len2) + return HX509_NAME_CONSTRAINT_ERROR; + if (strcasecmp(s + 1 + len2 - len1, c->u.rfc822Name) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + if (len1 < len2 && s[len2 - len1] != '.') + return HX509_NAME_CONSTRAINT_ERROR; + } + *match = 1; + return 0; + } + case choice_GeneralName_dNSName: { + size_t len1, len2; + + len1 = strlen(c->u.dNSName); + len2 = strlen(n->u.dNSName); + if (len1 > len2) + return HX509_NAME_CONSTRAINT_ERROR; + if (strcasecmp(&n->u.dNSName[len2 - len1], c->u.dNSName) != 0) + return HX509_NAME_CONSTRAINT_ERROR; + *match = 1; + return 0; + } + case choice_GeneralName_directoryName: { + Name c_name, n_name; + int ret; + + c_name._save.data = NULL; + c_name._save.length = 0; + c_name.element = c->u.directoryName.element; + c_name.u.rdnSequence = c->u.directoryName.u.rdnSequence; + + n_name._save.data = NULL; + n_name._save.length = 0; + n_name.element = n->u.directoryName.element; + n_name.u.rdnSequence = n->u.directoryName.u.rdnSequence; + + ret = match_X501Name(&c_name, &n_name); + if (ret == 0) + *match = 1; + return ret; + } + case choice_GeneralName_uniformResourceIdentifier: + case choice_GeneralName_iPAddress: + case choice_GeneralName_registeredID: + default: + return HX509_NAME_CONSTRAINT_ERROR; + } +} + +static int +match_alt_name(const GeneralName *n, const Certificate *c, + int *same, int *match) +{ + GeneralNames sa; + int ret, i, j; + + i = 0; + do { + ret = find_extension_subject_alt_name(c, &i, &sa); + if (ret == HX509_EXTENSION_NOT_FOUND) { + ret = 0; + break; + } else if (ret != 0) + break; + + for (j = 0; j < sa.len; j++) { + if (n->element == sa.val[j].element) { + *same = 1; + ret = match_general_name(n, &sa.val[j], match); + } + } + free_GeneralNames(&sa); + } while (1); + + return ret; +} + + +static int +match_tree(const GeneralSubtrees *t, const Certificate *c, int *match) +{ + int name, alt_name, same; + unsigned int i; + int ret = 0; + + name = alt_name = same = *match = 0; + for (i = 0; i < t->len; i++) { + if (t->val[i].minimum && t->val[i].maximum) + return HX509_RANGE; + + /* + * If the constraint apply to directoryNames, test is with + * subjectName of the certificate if the certificate have a + * non-null (empty) subjectName. + */ + + if (t->val[i].base.element == choice_GeneralName_directoryName + && !subject_null_p(c)) + { + GeneralName certname; + + + certname.element = choice_GeneralName_directoryName; + certname.u.directoryName.element = + c->tbsCertificate.subject.element; + certname.u.directoryName.u.rdnSequence = + c->tbsCertificate.subject.u.rdnSequence; + + ret = match_general_name(&t->val[i].base, &certname, &name); + } + + /* Handle subjectAltNames, this is icky since they + * restrictions only apply if the subjectAltName is of the + * same type. So if there have been a match of type, require + * altname to be set. + */ + ret = match_alt_name(&t->val[i].base, c, &same, &alt_name); + } + if (name && (!same || alt_name)) + *match = 1; + return ret; +} + +static int +check_name_constraints(hx509_context context, + const hx509_name_constraints *nc, + const Certificate *c) +{ + int match, ret; + int i; + + for (i = 0 ; i < nc->len; i++) { + GeneralSubtrees gs; + + if (nc->val[i].permittedSubtrees) { + GeneralSubtrees_SET(&gs, nc->val[i].permittedSubtrees); + ret = match_tree(&gs, c, &match); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + /* allow null subjectNames, they wont matches anything */ + if (match == 0 && !subject_null_p(c)) { + hx509_clear_error_string(context); + return HX509_VERIFY_CONSTRAINTS; + } + } + if (nc->val[i].excludedSubtrees) { + GeneralSubtrees_SET(&gs, nc->val[i].excludedSubtrees); + ret = match_tree(&gs, c, &match); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + if (match) { + hx509_clear_error_string(context); + return HX509_VERIFY_CONSTRAINTS; + } + } + } + return 0; +} + +static void +free_name_constraints(hx509_name_constraints *nc) +{ + int i; + + for (i = 0 ; i < nc->len; i++) + free_NameConstraints(&nc->val[i]); + free(nc->val); +} + +int +hx509_verify_path(hx509_context context, + hx509_verify_ctx ctx, + hx509_cert cert, + hx509_certs pool) +{ + hx509_name_constraints nc; + hx509_path path; +#if 0 + const AlgorithmIdentifier *alg_id; +#endif + int ret, i, proxy_cert_depth; + enum certtype type; + Name proxy_issuer; + + memset(&proxy_issuer, 0, sizeof(proxy_issuer)); + + ret = init_name_constraints(&nc); + if (ret) + return ret; + + path.val = NULL; + path.len = 0; + + if ((ctx->flags & HX509_VERIFY_CTX_F_TIME_SET) == 0) + ctx->time_now = time(NULL); + + /* + * Calculate the path from the certificate user presented to the + * to an anchor. + */ + ret = _hx509_calculate_path(context, 0, ctx->time_now, + ctx->trust_anchors, ctx->max_depth, + cert, pool, &path); + if (ret) + goto out; + +#if 0 + alg_id = path.val[path->len - 1]->data->tbsCertificate.signature; +#endif + + /* + * Check CA and proxy certificate chain from the top of the + * certificate chain. Also check certificate is valid with respect + * to the current time. + * + */ + + proxy_cert_depth = 0; + + if (ctx->flags & HX509_VERIFY_CTX_F_ALLOW_PROXY_CERTIFICATE) + type = PROXY_CERT; + else + type = EE_CERT; + + for (i = 0; i < path.len; i++) { + Certificate *c; + time_t t; + + c = _hx509_get_cert(path.val[i]); + + /* + * Lets do some basic check on issuer like + * keyUsage.keyCertSign and basicConstraints.cA bit depending + * on what type of certificate this is. + */ + + switch (type) { + case CA_CERT: + /* XXX make constants for keyusage */ + ret = check_key_usage(context, c, 1 << 5, + REQUIRE_RFC3280(ctx) ? TRUE : FALSE); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "Key usage missing from CA certificate"); + goto out; + } + break; + case PROXY_CERT: { + ProxyCertInfo info; + + if (is_proxy_cert(context, c, &info) == 0) { + int j; + + if (info.pCPathLenConstraint != NULL && + *info.pCPathLenConstraint < i) + { + free_ProxyCertInfo(&info); + ret = HX509_PATH_TOO_LONG; + hx509_set_error_string(context, 0, ret, + "Proxy certificate chain " + "longer then allowed"); + goto out; + } + /* XXX MUST check info.proxyPolicy */ + free_ProxyCertInfo(&info); + + j = 0; + if (find_extension(c, oid_id_x509_ce_subjectAltName(), &j)) { + ret = HX509_PROXY_CERT_INVALID; + hx509_set_error_string(context, 0, ret, + "Proxy certificate have explicity " + "forbidden subjectAltName"); + goto out; + } + + j = 0; + if (find_extension(c, oid_id_x509_ce_issuerAltName(), &j)) { + ret = HX509_PROXY_CERT_INVALID; + hx509_set_error_string(context, 0, ret, + "Proxy certificate have explicity " + "forbidden issuerAltName"); + goto out; + } + + /* + * The subject name of the proxy certificate should be + * CN=XXX,<proxy issuer>, prune of CN and check if its + * the same over the whole chain of proxy certs and + * then check with the EE cert when we get to it. + */ + + if (proxy_cert_depth) { + ret = _hx509_name_cmp(&proxy_issuer, &c->tbsCertificate.subject); + if (ret) { + ret = HX509_PROXY_CERT_NAME_WRONG; + hx509_set_error_string(context, 0, ret, + "Base proxy name not right"); + goto out; + } + } + + free_Name(&proxy_issuer); + + ret = copy_Name(&c->tbsCertificate.subject, &proxy_issuer); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + + j = proxy_issuer.u.rdnSequence.len; + if (proxy_issuer.u.rdnSequence.len < 2 + || proxy_issuer.u.rdnSequence.val[j - 1].len > 1 + || der_heim_oid_cmp(&proxy_issuer.u.rdnSequence.val[j - 1].val[0].type, + oid_id_at_commonName())) + { + ret = HX509_PROXY_CERT_NAME_WRONG; + hx509_set_error_string(context, 0, ret, + "Proxy name too short or " + "does not have Common name " + "at the top"); + goto out; + } + + free_RelativeDistinguishedName(&proxy_issuer.u.rdnSequence.val[j - 1]); + proxy_issuer.u.rdnSequence.len -= 1; + + ret = _hx509_name_cmp(&proxy_issuer, &c->tbsCertificate.issuer); + if (ret != 0) { + ret = HX509_PROXY_CERT_NAME_WRONG; + hx509_set_error_string(context, 0, ret, + "Proxy issuer name not as expected"); + goto out; + } + + break; + } else { + /* + * Now we are done with the proxy certificates, this + * cert was an EE cert and we we will fall though to + * EE checking below. + */ + type = EE_CERT; + /* FALLTHOUGH */ + } + } + case EE_CERT: + /* + * If there where any proxy certificates in the chain + * (proxy_cert_depth > 0), check that the proxy issuer + * matched proxy certificates "base" subject. + */ + if (proxy_cert_depth) { + + ret = _hx509_name_cmp(&proxy_issuer, + &c->tbsCertificate.subject); + if (ret) { + ret = HX509_PROXY_CERT_NAME_WRONG; + hx509_clear_error_string(context); + goto out; + } + if (cert->basename) + hx509_name_free(&cert->basename); + + ret = _hx509_name_from_Name(&proxy_issuer, &cert->basename); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + } + + break; + } + + ret = check_basic_constraints(context, c, type, i - proxy_cert_depth); + if (ret) + goto out; + + /* + * Don't check the trust anchors expiration time since they + * are transported out of band, from RFC3820. + */ + if (i + 1 != path.len || CHECK_TA(ctx)) { + + t = _hx509_Time2time_t(&c->tbsCertificate.validity.notBefore); + if (t > ctx->time_now) { + ret = HX509_CERT_USED_BEFORE_TIME; + hx509_clear_error_string(context); + goto out; + } + t = _hx509_Time2time_t(&c->tbsCertificate.validity.notAfter); + if (t < ctx->time_now) { + ret = HX509_CERT_USED_AFTER_TIME; + hx509_clear_error_string(context); + goto out; + } + } + + if (type == EE_CERT) + type = CA_CERT; + else if (type == PROXY_CERT) + proxy_cert_depth++; + } + + /* + * Verify constraints, do this backward so path constraints are + * checked in the right order. + */ + + for (ret = 0, i = path.len - 1; i >= 0; i--) { + Certificate *c; + + c = _hx509_get_cert(path.val[i]); + +#if 0 + /* check that algorithm and parameters is the same */ + /* XXX this is wrong */ + ret = alg_cmp(&c->tbsCertificate.signature, alg_id); + if (ret) { + hx509_clear_error_string(context); + ret = HX509_PATH_ALGORITHM_CHANGED; + goto out; + } +#endif + + /* verify name constraints, not for selfsigned and anchor */ + if (!certificate_is_self_signed(c) || i == path.len - 1) { + ret = check_name_constraints(context, &nc, c); + if (ret) { + goto out; + } + } + ret = add_name_constraints(context, c, i == 0, &nc); + if (ret) + goto out; + + /* XXX verify all other silly constraints */ + + } + + /* + * Verify that no certificates has been revoked. + */ + + if (ctx->revoke_ctx) { + hx509_certs certs; + + ret = hx509_certs_init(context, "MEMORY:revoke-certs", 0, + NULL, &certs); + if (ret) + goto out; + + for (i = 0; i < path.len; i++) { + ret = hx509_certs_add(context, certs, path.val[i]); + if (ret) { + hx509_certs_free(&certs); + goto out; + } + } + ret = hx509_certs_merge(context, certs, pool); + if (ret) { + hx509_certs_free(&certs); + goto out; + } + + for (i = 0; i < path.len - 1; i++) { + int parent = (i < path.len - 1) ? i + 1 : i; + + ret = hx509_revoke_verify(context, + ctx->revoke_ctx, + certs, + ctx->time_now, + path.val[i], + path.val[parent]); + if (ret) { + hx509_certs_free(&certs); + goto out; + } + } + hx509_certs_free(&certs); + } + +#if 0 + for (i = path.len - 1; i >= 0; i--) { + _hx509_print_cert_subject(path.val[i]); + } +#endif + + /* + * Verify signatures, do this backward so public key working + * parameter is passed up from the anchor up though the chain. + */ + + for (i = path.len - 1; i >= 0; i--) { + Certificate *signer, *c; + + c = _hx509_get_cert(path.val[i]); + + /* is last in chain (trust anchor) */ + if (i == path.len - 1) { + signer = path.val[i]->data; + + /* if trust anchor is not self signed, don't check sig */ + if (!certificate_is_self_signed(signer)) + continue; + } else { + /* take next certificate in chain */ + signer = path.val[i + 1]->data; + } + + /* verify signatureValue */ + ret = _hx509_verify_signature_bitstring(context, + signer, + &c->signatureAlgorithm, + &c->tbsCertificate._save, + &c->signatureValue); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "Failed to verify signature of certificate"); + goto out; + } + } + +out: + free_Name(&proxy_issuer); + free_name_constraints(&nc); + _hx509_path_free(&path); + + return ret; +} + +int +hx509_verify_signature(hx509_context context, + const hx509_cert signer, + const AlgorithmIdentifier *alg, + const heim_octet_string *data, + const heim_octet_string *sig) +{ + return _hx509_verify_signature(context, signer->data, alg, data, sig); +} + +int +hx509_verify_hostname(hx509_context context, + const hx509_cert cert, + int require_match, + const char *hostname, + const struct sockaddr *sa, + /* XXX krb5_socklen_t */ int sa_size) +{ + if (sa && sa_size <= 0) + return EINVAL; + return 0; +} + +int +_hx509_set_cert_attribute(hx509_context context, + hx509_cert cert, + const heim_oid *oid, + const heim_octet_string *attr) +{ + hx509_cert_attribute a; + void *d; + + if (hx509_cert_get_attribute(cert, oid) != NULL) + return 0; + + d = realloc(cert->attrs.val, + sizeof(cert->attrs.val[0]) * (cert->attrs.len + 1)); + if (d == NULL) { + hx509_clear_error_string(context); + return ENOMEM; + } + cert->attrs.val = d; + + a = malloc(sizeof(*a)); + if (a == NULL) + return ENOMEM; + + der_copy_octet_string(attr, &a->data); + der_copy_oid(oid, &a->oid); + + cert->attrs.val[cert->attrs.len] = a; + cert->attrs.len++; + + return 0; +} + +hx509_cert_attribute +hx509_cert_get_attribute(hx509_cert cert, const heim_oid *oid) +{ + int i; + for (i = 0; i < cert->attrs.len; i++) + if (der_heim_oid_cmp(oid, &cert->attrs.val[i]->oid) == 0) + return cert->attrs.val[i]; + return NULL; +} + +int +hx509_cert_set_friendly_name(hx509_cert cert, const char *name) +{ + if (cert->friendlyname) + free(cert->friendlyname); + cert->friendlyname = strdup(name); + if (cert->friendlyname == NULL) + return ENOMEM; + return 0; +} + + +const char * +hx509_cert_get_friendly_name(hx509_cert cert) +{ + hx509_cert_attribute a; + PKCS9_friendlyName n; + size_t sz; + int ret, i; + + if (cert->friendlyname) + return cert->friendlyname; + + a = hx509_cert_get_attribute(cert, oid_id_pkcs_9_at_friendlyName()); + if (a == NULL) { + /* XXX use subject name ? */ + return NULL; + } + + ret = decode_PKCS9_friendlyName(a->data.data, a->data.length, &n, &sz); + if (ret) + return NULL; + + if (n.len != 1) { + free_PKCS9_friendlyName(&n); + return NULL; + } + + cert->friendlyname = malloc(n.val[0].length + 1); + if (cert->friendlyname == NULL) { + free_PKCS9_friendlyName(&n); + return NULL; + } + + for (i = 0; i < n.val[0].length; i++) { + if (n.val[0].data[i] <= 0xff) + cert->friendlyname[i] = n.val[0].data[i] & 0xff; + else + cert->friendlyname[i] = 'X'; + } + cert->friendlyname[i] = '\0'; + free_PKCS9_friendlyName(&n); + + return cert->friendlyname; +} + +void +_hx509_query_clear(hx509_query *q) +{ + memset(q, 0, sizeof(*q)); +} + +int +hx509_query_alloc(hx509_context context, hx509_query **q) +{ + *q = calloc(1, sizeof(**q)); + if (*q == NULL) + return ENOMEM; + return 0; +} + +void +hx509_query_match_option(hx509_query *q, hx509_query_option option) +{ + switch(option) { + case HX509_QUERY_OPTION_PRIVATE_KEY: + q->match |= HX509_QUERY_PRIVATE_KEY; + break; + case HX509_QUERY_OPTION_KU_ENCIPHERMENT: + q->match |= HX509_QUERY_KU_ENCIPHERMENT; + break; + case HX509_QUERY_OPTION_KU_DIGITALSIGNATURE: + q->match |= HX509_QUERY_KU_DIGITALSIGNATURE; + break; + case HX509_QUERY_OPTION_KU_KEYCERTSIGN: + q->match |= HX509_QUERY_KU_KEYCERTSIGN; + break; + case HX509_QUERY_OPTION_END: + default: + break; + } +} + +int +hx509_query_match_issuer_serial(hx509_query *q, + const Name *issuer, + const heim_integer *serialNumber) +{ + int ret; + if (q->serial) { + der_free_heim_integer(q->serial); + free(q->serial); + } + q->serial = malloc(sizeof(*q->serial)); + if (q->serial == NULL) + return ENOMEM; + ret = der_copy_heim_integer(serialNumber, q->serial); + if (ret) { + free(q->serial); + q->serial = NULL; + return ret; + } + if (q->issuer_name) { + free_Name(q->issuer_name); + free(q->issuer_name); + } + q->issuer_name = malloc(sizeof(*q->issuer_name)); + if (q->issuer_name == NULL) + return ENOMEM; + ret = copy_Name(issuer, q->issuer_name); + if (ret) { + free(q->issuer_name); + q->issuer_name = NULL; + return ret; + } + q->match |= HX509_QUERY_MATCH_SERIALNUMBER|HX509_QUERY_MATCH_ISSUER_NAME; + return 0; +} + + +int +hx509_query_match_friendly_name(hx509_query *q, const char *name) +{ + if (q->friendlyname) + free(q->friendlyname); + q->friendlyname = strdup(name); + if (q->friendlyname == NULL) + return ENOMEM; + q->match |= HX509_QUERY_MATCH_FRIENDLY_NAME; + return 0; +} + +int +hx509_query_match_cmp_func(hx509_query *q, + int (*func)(void *, hx509_cert), + void *ctx) +{ + if (func) + q->match |= HX509_QUERY_MATCH_FUNCTION; + else + q->match &= ~HX509_QUERY_MATCH_FUNCTION; + q->cmp_func = func; + q->cmp_func_ctx = ctx; + return 0; +} + + +void +hx509_query_free(hx509_context context, hx509_query *q) +{ + if (q->serial) { + der_free_heim_integer(q->serial); + free(q->serial); + q->serial = NULL; + } + if (q->issuer_name) { + free_Name(q->issuer_name); + free(q->issuer_name); + q->issuer_name = NULL; + } + if (q) { + free(q->friendlyname); + memset(q, 0, sizeof(*q)); + } + free(q); +} + +int +_hx509_query_match_cert(hx509_context context, const hx509_query *q, hx509_cert cert) +{ + Certificate *c = _hx509_get_cert(cert); + + if ((q->match & HX509_QUERY_FIND_ISSUER_CERT) && + _hx509_cert_is_parent_cmp(q->subject, c, 0) != 0) + return 0; + + if ((q->match & HX509_QUERY_MATCH_CERTIFICATE) && + _hx509_Certificate_cmp(q->certificate, c) != 0) + return 0; + + if ((q->match & HX509_QUERY_MATCH_SERIALNUMBER) + && der_heim_integer_cmp(&c->tbsCertificate.serialNumber, q->serial) != 0) + return 0; + + if ((q->match & HX509_QUERY_MATCH_ISSUER_NAME) + && _hx509_name_cmp(&c->tbsCertificate.issuer, q->issuer_name) != 0) + return 0; + + if ((q->match & HX509_QUERY_MATCH_SUBJECT_NAME) + && _hx509_name_cmp(&c->tbsCertificate.subject, q->subject_name) != 0) + return 0; + + if (q->match & HX509_QUERY_MATCH_SUBJECT_KEY_ID) { + SubjectKeyIdentifier si; + int ret; + + ret = _hx509_find_extension_subject_key_id(c, &si); + if (ret == 0) { + if (der_heim_octet_string_cmp(&si, q->subject_id) != 0) + ret = 1; + free_SubjectKeyIdentifier(&si); + } + if (ret) + return 0; + } + if ((q->match & HX509_QUERY_MATCH_ISSUER_ID)) + return 0; + if ((q->match & HX509_QUERY_PRIVATE_KEY) && + _hx509_cert_private_key(cert) == NULL) + return 0; + + { + unsigned ku = 0; + if (q->match & HX509_QUERY_KU_DIGITALSIGNATURE) + ku |= (1 << 0); + if (q->match & HX509_QUERY_KU_NONREPUDIATION) + ku |= (1 << 1); + if (q->match & HX509_QUERY_KU_ENCIPHERMENT) + ku |= (1 << 2); + if (q->match & HX509_QUERY_KU_DATAENCIPHERMENT) + ku |= (1 << 3); + if (q->match & HX509_QUERY_KU_KEYAGREEMENT) + ku |= (1 << 4); + if (q->match & HX509_QUERY_KU_KEYCERTSIGN) + ku |= (1 << 5); + if (q->match & HX509_QUERY_KU_CRLSIGN) + ku |= (1 << 6); + if (ku && check_key_usage(context, c, ku, TRUE)) + return 0; + } + if ((q->match & HX509_QUERY_ANCHOR)) + return 0; + + if (q->match & HX509_QUERY_MATCH_LOCAL_KEY_ID) { + hx509_cert_attribute a; + + a = hx509_cert_get_attribute(cert, oid_id_pkcs_9_at_localKeyId()); + if (a == NULL) + return 0; + if (der_heim_octet_string_cmp(&a->data, q->local_key_id) != 0) + return 0; + } + + if (q->match & HX509_QUERY_NO_MATCH_PATH) { + size_t i; + + for (i = 0; i < q->path->len; i++) + if (hx509_cert_cmp(q->path->val[i], cert) == 0) + return 0; + } + if (q->match & HX509_QUERY_MATCH_FRIENDLY_NAME) { + const char *name = hx509_cert_get_friendly_name(cert); + if (name == NULL) + return 0; + if (strcasecmp(q->friendlyname, name) != 0) + return 0; + } + if (q->match & HX509_QUERY_MATCH_FUNCTION) { + int ret = (*q->cmp_func)(q->cmp_func_ctx, cert); + if (ret != 0) + return 0; + } + + if (q->match & HX509_QUERY_MATCH_KEY_HASH_SHA1) { + heim_octet_string os; + int ret; + + os.data = c->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.data; + os.length = + c->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.length / 8; + + ret = _hx509_verify_signature(context, + NULL, + hx509_signature_sha1(), + &os, + q->keyhash_sha1); + if (ret != 0) + return 0; + } + + if (q->match & HX509_QUERY_MATCH_TIME) { + time_t t; + t = _hx509_Time2time_t(&c->tbsCertificate.validity.notBefore); + if (t > q->timenow) + return 0; + t = _hx509_Time2time_t(&c->tbsCertificate.validity.notAfter); + if (t < q->timenow) + return 0; + } + + if (q->match & ~HX509_QUERY_MASK) + return 0; + + return 1; +} + +int +hx509_cert_check_eku(hx509_context context, hx509_cert cert, + const heim_oid *eku, int allow_any_eku) +{ + ExtKeyUsage e; + int ret, i; + + ret = find_extension_eku(_hx509_get_cert(cert), &e); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + + for (i = 0; i < e.len; i++) { + if (der_heim_oid_cmp(eku, &e.val[i]) == 0) { + free_ExtKeyUsage(&e); + return 0; + } + if (allow_any_eku) { +#if 0 + if (der_heim_oid_cmp(id_any_eku, &e.val[i]) == 0) { + free_ExtKeyUsage(&e); + return 0; + } +#endif + } + } + free_ExtKeyUsage(&e); + hx509_clear_error_string(context); + return HX509_CERTIFICATE_MISSING_EKU; +} + +int +_hx509_cert_get_keyusage(hx509_context context, + hx509_cert c, + KeyUsage *ku) +{ + Certificate *cert; + const Extension *e; + size_t size; + int ret, i = 0; + + memset(ku, 0, sizeof(*ku)); + + cert = _hx509_get_cert(c); + + if (_hx509_cert_get_version(cert) < 3) + return 0; + + e = find_extension(cert, oid_id_x509_ce_keyUsage(), &i); + if (e == NULL) + return HX509_KU_CERT_MISSING; + + ret = decode_KeyUsage(e->extnValue.data, e->extnValue.length, ku, &size); + if (ret) + return ret; + return 0; +} |